I am an instrument with which you can create something special like an emotional state. Make a person happy or sad, or give them something to hate. I am thin and I'm used every day by some, and I'll admit it, I'm kind of a friend to your thumb. Use me at your own pace, and I promise to you I'll leave some kind of trace. What am I?

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papersbuttontextinknucklactionletterstringvisionvoicesinkpengpicksbongostemperremotescreenwhislemouthspistonpaibanpinpiapulaluiphonepaintspicolocoronaplacespointsprayerplatespinkieaaaaaabanjosfood!!cameratrumpefingerplaquegrgrfesmilespickleplantegrassspervetpuckedpickedpianispulgarplagueprimerpreferpiccolparodyvioletviolinidkkkkquotescomedicomedycorderrecordpianostygerstabletthreadkazooomobiletvljknphonespencelgutarecreditneedleguitarplantsnatureThe first user to correctly answer this riddle was darthnigel